"Save the Planet!"

Nope... Earth will get along.

The geologic record includes many past mass extinctions.
The planet is still here.

Combatting human-caused global warming is not about the planet, it's about US.
(Well... and the polar bears.)

Some huge percentage of all species that have ever existed are no longer with us.
Think T-Rex.

Combatting human-caused warming is not to "save the planet" - it's to save US!
The next mass extinction in the newly named "Anthropocene" is very likely to include H. sapiens.

The universe won't notice.